@ph11: Hi there. You said you have problem in compilation time of lib32-portaudio. Can you please post your build log output with the error message? (you can post in a paste site like pastebin.com or in 'code formatted text' in here)

The problem is that the installation of lib32-portaudio needs lib32-jack, but it's impossible to install lib32-jack and keep jack2.
I've got a problem if I change lib32-jack to jack2 in the dependancies.
I didn't try to install with lib32-jack.
There is the compilation's error :

I happen to be the maintainer of lib32-portaudio, and I could fix its dependency list. But, first, can you please install jack2-multilib and let me know if it works for your applications (as musician) and pcsx2 ?